MK: TTA (So relaxing), the Walt Disney World Railroad that takes you around the MK, Hall of Presidents, Monsters Inc Laugh Floor, Philharmagic and well, since it's being brought up, Peter Pan's Flight FTW!
Epcot: Living with the Land and all of the films, even the 360 Circlevision films
HS: Great Movie Ride (A great showcase of the most iconic films. Could it use some updating? Yeah, possibly....)
AK: Can't think of any but does the Wildlife Express Train to and from Rafiki's Planet Watch count? It's a relaxing ride and as a kid, I love riding trains.